Pablo Casanueva began his relationship with the image through painting, followed by photography and film. His main works are: the film 8 filmes sobre la guerra (2021), selected in the Muestra de Artes Plásticas de Asturias and in the Punto de Vista International Documentary Film Festival in Pamplona; the photographic and audiovisual exhibition Xente (2021), selected in the Sala Borrón and in the Catálogo de Artes Plásticas y Visuales del Principado de Asturias; the short films La sele construcción de la memoria (2017) and Escontra la casualidá (2018), both premiered at the Xixón International Film Festival or the musical short film Mensaxe pa la mocedá del Imperiu (2019) based on the work of Xaime Martínez (National Poetry Prize Moza 2019). Other outstanding works include: Conserveres (2017), a video creation presented at the LAN festival (Bilbao); Al final de este viaje (2017), a short film that won the Interrail FICX 55 Award; the documentary and web series El Cobayu (2018); the video creation Llaberintu (2019) presented at the FICX or the documentary piece Filme urxente sobre La Plaza (2018).

He became known in 2013 with the premiere of Bernabé, his first feature film and the first in Asturian. With it, he was present at the Xixón International Film Festival, the Cine Europa Festival and the Lorient Interceltic Festival, among several screenings in Asturias. He is a member of the Association for the Recovery of Historical Memory, of the Advisory Council for Linguistic Policy of the Principality of Asturias and is linked to several social platforms. He studied Audiovisual Communication at the University of Burgos and at the University of the Basque Country in Bilbao.